Update blank.yml

Author: rain0r

.github/workflows/blank.yml

@@ -17,7 +17,7 @@ jobs:
         uses: Legion2/swagger-ui-action@v1
         with:
           output: swagger-ui
-          spec-url: https://raw.githubusercontent.com/rain0r/listenbrainz-openapi/refs/heads/master/lb.yaml
+          spec-url: ${{ github.workspace }}&lb.yaml
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - name: Deploy to GitHub Pages
         uses: peaceiris/actions-gh-pages@v4